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Meniscus Shape Control Using Electrowetting and Its Application to Optical Devices
摘要： Electrowetting is a technique to modify wettability and meniscus shapes on electrodes by applying voltage to the electrodes. In the present article, we introduce principles of electrowetting deriving the equation connecting voltage and contact angle. Then we reviews related articles on optical devices using electrowetting including our previous works; a liquid prism controlling optic-axis using electrowetting. Numerical simulation solved meniscus shapes between each liquid to predict the relation between applied voltage and optic angle. Results in experiments and simulations are briefly reported.
关键词： Meniscus,Electrowetting,Numerical simulation,Optical devices,Wetting
更新于2025-09-23 15:21:21
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Uncertainty budgets of major ozone absorption cross sections used in UV remote sensing applications
摘要： Detailed uncertainty budgets of three major ultraviolet (UV) ozone absorption cross-section datasets that are used in remote sensing application are provided and discussed. The datasets are Bass–Paur (BP), Brion–Daumont–Malicet (BDM), and the more recent Serdyuchenko–Gorshelev (SG). For most remote sensing application the temperature dependence of the Huggins ozone band is described by a quadratic polynomial in temperature (Bass–Paur parameterization) by applying a regression to the cross-section data measured at selected atmospherically relevant temperatures. For traceability of atmospheric ozone measurements, uncertainties from the laboratory measurements as well as from the temperature parameterization of the ozone cross-section data are needed as input for detailed uncertainty calculation of atmospheric ozone measurements. In this paper the uncertainty budgets of the three major ozone cross-section datasets are summarized from the original literature. The quadratic temperature dependence of the cross-section datasets is investigated. Combined uncertainty budgets is provided for all datasets based upon Monte Carlo simulation that includes uncertainties from the laboratory measurements as well as uncertainties from the temperature parameterization. Between 300 and 330 nm both BDM and SG have an overall uncertainty of 1.5 %, while BP has a somewhat larger uncertainty of 2.1 %. At temperatures below about 215 K, uncertainties in the BDM data increase more strongly than the others due to the lack of very low temperature laboratory measurements (lowest temperature of BDM available is 218 K).
关键词： uncertainty budgets,Monte Carlo simulation,temperature dependence,UV remote sensing,ozone absorption cross sections
更新于2025-09-23 15:21:21
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[IEEE 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Kyoto, Japan (2018.7.9-2018.7.13)] 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Generation of light beams by electron beam excited surface plasmons
摘要： Manipulation of Smith-Purcell radiation (SPR) by electron-bunch excitation of localized surface plasmon (LSP) of gold (Au) disc arrays on Au substrate is investigated by FDTD simulation. When the wavelength of LSP mode is within the SPR emission band, SPR is locked and enhanced at the LSP wavelength. The emission angle of LSP-locked SPR still follows the wavelength-angle relation of traditional SPR. Furthermore, both the emission wavelength and angle increase as the radius and height of Au disc increase.
关键词： FDTD simulation,Smith-Purcell radiation (SPR),localized surface plasmon (LSP)
更新于2025-09-23 15:21:21
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[Advances in Intelligent Systems and Computing] Soft Computing for Problem Solving Volume 817 (SocProS 2017, Volume 2) || Design a New Protocol and Compare with BB84 Protocol for Quantum Key Distribution
摘要： Quantum key distribution is the latest advancement in quantum cryptography. There are several QKD protocols like BB84, B92, Ekert91, COW, SARG04, out of which BB84 is the first protocol developed in 1984. In this paper, we are discussing first about the working of BB84 protocol and then proposing a new protocol which is a variation over BB84 protocol, second the design of simulation setup is discussed, and then we compared the performance of BB84 with the proposed protocol and proved it much better in case of capacity and error estimation. Object-oriented approach is used in the simulation designing for new protocol and BB84 protocol.
关键词： BB84 simulation,Quantum cryptography,QKD protocols
更新于2025-09-23 15:21:21
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[IEEE 2018 VII. Lighting Conference of the Visegrad Countries (Lumen V4) - Trebic, Czech Republic (2018.9.18-2018.9.20)] 2018 VII. Lighting Conference of the Visegrad Countries (Lumen V4) - The Floodlighting Design System Based on the Object's Daytime Photography
摘要： The article presents a solution to the problem of work and time consuming of the objects floodlighting projects creation. Currently, the only technically correct methods for creating such projects are a three-dimensional computer simulation using photometric files of luminaires or field trials using real equipment. Both of these methods have their advantages, but also many disadvantages. Among architects, in turn, a popular method of floodlighting designing is graphic processing of daytime or evening images objects. The method is relatively fast and it gives photorealistic effects but it is technically incorrect. An architect or graphic designer creates a picture that is attractive to the eye, but usually has nothing to do with reality. This is due to the fact that the lighting parameters of both lighting equipment and analyzing this type of project in terms of technology are not taken into account. The article presents a solution to this problem. It describes a system created especially for this purpose based on a dedicated computer application that allows simulation of the object floodlighting using its daily photograph. This is technically correct simulation, because it uses photometric files of luminaires. The system allows correction of basic photometric parameters: editing of photometric files, luminous flux, light in different directions, color temperature and the use of color filters. The computer application also enables photo editing, geometric correction, measurement and defining reflection and transmission properties of materials from which the object is actually built. Full lighting analysis is also possible and is based on luminance and illuminance distributions generated in the false color scale and measurements in points and selected areas. The advantages, disadvantages and limitations of the developed system are presented.
关键词： luminance distribution,visualization,floodlighting,advanced lighting simulation,lighting design
更新于2025-09-23 15:21:21
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Photothermal Effects Induced by Surface Plasmon Resonance at Graphene/Gold Nanointerfaces: A Multiscale Modeling Study
摘要： Surface plasmon resonance (SPR) biosensors have enormous potential in biological recognitions and biomolecular interactions, especially for the real time measurement of disease diagnosis and drug screening. Extensive efforts have been invested to ameliorate the sensing performances, while the photothermal effects, which are induced by the plasmon resonance, have an obvious impact. However, due to the limitations of experimental approaches, the theoretical mechanisms and specific influences of the SPR sensors with photothermal effects are few researched. Here, a multiscale simulation method is developed to investigate the photothermal effects at graphene/gold (Au) nanointerfaces, and to calculate the quantitative contribution of the photothermal effects towards high reliability SPR sensors in order to elucidate their influence on the sensing performances by means of first-principle calculations and molecular dynamics simulations. Our results indicate that the sensitivity and detection accuracy of graphene/Au SPR sensors can be tailored from 0 K to 600 K, due to the tunable dielectric constants of Au and graphene films through temperature variation. By controlling the its material thickness, interfacial combination and lattice strain, an optimized graphene/Au SPR sensor with higher sensitivity, detection accuracy, and reliability to the temperature rising has been achieved. Such multiscale simulation method, which is capable of seeking both the role and the underlying mechanism of the interfacial phenomena, can serve as an excellent guideline for the performance optimization and commercialized application of SPR sensors in the analytical chemistry and biomedical fields.
关键词： graphene/gold nanointerface,photothermal effects,surface plasmon resonance,multiscale simulation method,sensitivity and detection accuracy
更新于2025-09-23 15:21:21
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Parallel domain decomposition methods for a quantum-corrected drift–diffusion model for MOSFET devices
摘要： In this paper, we describe parallel domain decomposition methods based on the restricted additive Schwarz (RAS) method for a quantum-corrected drift-diffusion (QCDD) model for MOSFET devices. We have developed hybrid Message Passing Interface (MPI)/OpenMP parallelization algorithms of the QCDD system. For internode parallelization, two extensions of the RAS method are newly developed for the QCDD model. For intranode parallelization, we combine the conjugate gradient (CG) and BiCGSTAB procedures with a splitting-up operator method to realize parallelization of the incomplete factorization. The parallel numerical results for a three-dimensional Si bulk n-MOSFET on a multi-core NEC SX-ACE parallel computer are demonstrated. The intranode parallel numerical results are further evaluated on a many-core Cray XC40 parallel computer.
关键词： Restricted additive Schwarz method,Domain decomposition method,Numerical methods,Device simulation,Semiconductor,quantum-corrected drift–diffusion model
更新于2025-09-23 15:21:21
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[IEEE 2018 9th International Conference on Ultrawideband and Ultrashort Impulse Signals (UWBUSIS) - Odessa, Ukraine (2018.9.4-2018.9.7)] 2018 9th International Conference on Ultrawideband and Ultrashort Impulse Signals (UWBUSIS) - The Action of Ultra-Short Super-Powerful Radio Pulses on the Earth's Atmosphere and Ionosphere
摘要： Numerical simulations of disturbances in the electron temperature and density arising from the action of ultra-short super-powerful radio pulses with different durations and powers on the Earth's atmosphere and ionosphere are presented. It is demonstrated that the electron density in the 30–60 km altitude range can be increased by 12 orders of magnitude, while the electron temperature shows an increase of the order of 10 to 100 times. The pulse durations and powers needed to create artificial ionized layers have been estimated.
关键词： ultra-short radio pulse,disturbances,numerical simulation,atmosphere,electron temperature,ionosphere,super-powerful radio pulse,electron density
更新于2025-09-23 15:21:21
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Toward a Precision Ophthalmology: Targeting the Retina
摘要： Efficacious drug delivery to the posterior chamber of the eye is a very challenging problem due to the many physiological barriers that protect the eye against the entry of exogenous substances. To avoid, or to limit, the action of these barriers several drug delivery routes are being investigated and used in clinical ophthalmology. To assist medical and pharmaceutical research, mathematical modeling of the release kinetics assumes a crucial role. In this paper three-dimensional computational models that simulate drug delivery from two different biodegradable polymeric platforms---intravitreal and transscleral---are presented. The models consist of coupled systems of partial differential equations linked by interface conditions, where the properties of the drug, of the implant, and of the eye tissues are taken into account. Peak concentrations and residence times are compared for the two delivery routes. Particular attention is devoted to the modeling of the blood retinal barrier (BRB). The influence of retinal diseases, represented by parameters that characterize the permeation through the BRB, is analyzed. Numerical simulations that illustrate the differences in the behavior of drug released from intravitreal and transscleral implants are included. The numerical results are compared with available experimental data.
关键词： partial differential equations,well-posedness,numerical simulation,drug delivery,retina
更新于2025-09-23 15:21:21
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Dynamic model based on voltage transfer curve for pattern formation in dielectric barrier glow discharge
摘要： Simulation work is very important for understanding the formation of self-organized discharge patterns. Previous works have witnessed different models derived from other systems for simulation of discharge pattern, but most of these models are complicated and time-consuming. In this paper, we introduce a convenient phenomenological dynamic model based on the basic dynamic process of glow discharge and the voltage transfer curve (VTC) to study the dielectric barrier glow discharge (DBGD) pattern. VTC is an important characteristic of DBGD, which plots the change of wall voltage after a discharge as a function of the initial total gap voltage. In the modeling, the combined effect of the discharge conditions is included in VTC, and the activation-inhibition effect is expressed by a spatial interaction term. Besides, the model reduces the dimensionality of the system by just considering the integration effect of current ?ow. All these greatly facilitate the construction of this model. Numerical simulations turn out to be in good accordance with our previous ?uid modeling and experimental result.
关键词： pattern formation,simulation,dielectric barrier glow discharge,voltage transfer curve,dynamic model
更新于2025-09-23 15:21:21